Commas
Q. In our international magazine mailings, we always include the country name; however, we would like to know the correct procedure for including “USA” after the city/state/ZIP. Is there a comma after the ZIP code or not? Your assistance would greatly reduce the amount of tension/dissension among the writers and editor and proofreader.
A. There should be no comma before or after a zip code:
1427 E. 60th St., Chicago, IL 60637 USA
Note also that commas may be omitted between the city and the two-letter abbreviations preferred by the U.S. Postal Service (see paragraph 15.31 in the fifteenth edition).
